Periodic Table Practice Questions
NECO (Nigeria) · NECO Chemistry · 133 free MCQs with instant results and detailed explanations.
133
Total
39
Easy
68
Medium
26
Hard
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Sample Questions from Periodic Table
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Q1
Easy
Which of the following elements is located in Group 1 of the Periodic Table?
A.
Sodium
B.
Magnesium
C.
Calcium
D.
Aluminum
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Correct Answer: A
Sodium is classified as an alkali metal and is found in Group 1 of the Periodic Table, which contains elements with similar chemical properties.
Q2
Easy
Which element is a noble gas found in Period 3 of the Periodic Table?
A.
Argon
B.
Chlorine
C.
Sulfur
D.
Phosphorus
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Correct Answer: A
Argon is the noble gas in Period 3, characterized by its inertness and full outer electron shell, making it stable.
Q3
Easy
What is the primary characteristic of elements in the same group of the Periodic Table?
A.
They have similar atomic masses.
B.
They have the same number of valence electrons.
C.
They have identical color properties.
D.
They exhibit the same physical state at room temperature.
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Correct Answer: B
Elements in the same group have the same number of valence electrons, which determines their chemical reactivity and bonding behavior.
Q4
Medium
Which of the following groups contains alkali metals?
A.
Group 1
B.
Group 2
C.
Group 13
D.
Group 14
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Correct Answer: A
Alkali metals are found in Group 1 of the periodic table. They are characterized by having one electron in their outermost shell, which they readily lose to form positive ions.
Q5
Medium
What is the principal characteristic of noble gases?
A.
They are highly reactive.
B.
They have complete valence electron shells.
C.
They readily form compounds.
D.
They are all gases at room temperature.
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Correct Answer: B
Noble gases have complete valence electron shells, which makes them very stable and generally unreactive. This stability is due to having the maximum number of electrons in their outer shell.
Q6
Medium
Which of the following elements is a transition metal?
A.
Calcium
B.
Iron
C.
Sodium
D.
Boron
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Correct Answer: B
Iron is classified as a transition metal because it is found in the d-block of the periodic table and has the ability to form variable oxidation states and colored compounds.
Q7
Medium
What is the main reason for the decrease in atomic radius down a group in the periodic table?
A.
Increase in nuclear charge
B.
Increase in the number of electron shells
C.
Decrease in electron shielding
D.
Increase in ionization energy
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Correct Answer: B
The atomic radius increases down a group primarily due to the addition of new electron shells, which outweighs the effect of increased nuclear charge, leading to a larger atomic size.
Q8
Hard
Which of the following elements has the highest electronegativity according to the Pauling scale?
A.
Fluorine
B.
Chlorine
C.
Oxygen
D.
Nitrogen
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Correct Answer: A
Fluorine has the highest electronegativity value of 4.0 on the Pauling scale, making it the most electronegative element. Chlorine, Oxygen, and Nitrogen have lower electronegativity values.
Q9
Hard
An element has an atomic number of 29. Which of the following statements about this element is correct?
A.
It is a noble gas.
B.
It is a transition metal.
C.
It is an alkali metal.
D.
It is a halogen.
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Correct Answer: B
The element with atomic number 29 is Copper (Cu), which is classified as a transition metal. Noble gases, alkali metals, and halogens are from different groups in the periodic table.
Q10
Hard
Which of the following elements exhibits the highest electronegativity according to the Pauling scale?
A.
Fluorine
B.
Oxygen
C.
Chlorine
D.
Nitrogen
Show Answer & Explanation
Correct Answer: A
Fluorine has the highest electronegativity of all elements at 3.98 on the Pauling scale, making it more capable of attracting electrons compared to the others listed.
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Periodic Table — NECO (Nigeria) NECO Chemistry Practice Questions Online
This page contains 133 practice MCQs for the chapter Periodic Table in NECO (Nigeria) NECO Chemistry. The questions are organized by difficulty — 39 easy, 68 medium, 26 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.